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-- C940005.A

--

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--

-- OBJECTIVE:

--      Check that the body of a protected function can have internal calls

--      to other protected functions and that the body of a protected

--      procedure can have internal calls to protected procedures and to

--      protected functions.

--

-- TEST DESCRIPTION:

--      Simulate a meter at a freeway on-ramp which, when real-time sensors

--      determine that the freeway is becoming saturated, triggers stop lights

--      which control the access of vehicles to prevent further saturation.

--      Each on-ramp is represented by a protected object - in this case only

--      one is shown (Test_Ramp).  The routines to sample and alter the states

--      of the various sensors, to queue the vehicles on the meter and to

--      release them are all part of the  protected object and can be shared

--      by various tasks. Apart from the function/procedure tests this example

--      has a mix of other tasking features.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      13 Nov 95   SAIC    Updated and fixed bugs ACVC 2.0.1

--

--!

with Report;

with ImpDef;

with Ada.Calendar;

procedure C940005 is

begin

   Report.Test ("C940005", "Check internal calls of protected functions" &

                        " and procedures");

   declare  -- encapsulate the test

      function "+" (Left : Ada.Calendar.Time; Right: Duration)

                            return Ada.Calendar.Time renames Ada.Calendar."+";

      -- Weighted load given to each potential problem area and accumulated

      type Load_Factor is range 0..8;

      Clear_Level    : constant Load_Factor := 0;

      Minimum_Level  : constant Load_Factor := 1;

      Moderate_Level : constant Load_Factor := 2;

      Serious_Level  : constant Load_Factor := 4;

      Critical_Level : constant Load_Factor := 6;

      -- Weighted loads given to each  Sample Point (pure weights, not levels)

      Local_Overload_wt         : constant Load_Factor := 1;

      Next_Ramp_in_Overload_wt  : constant Load_Factor := 1;

      Ramp_Junction_in_Overload_wt : constant Load_Factor :=2; --higher wght

      -- ::::  other weighted loads

      TC_Multiplier : integer := 1;  -- changed half way through

      TC_Expected_Passage_Total : constant integer := 486;

      -- This is the time between synchronizing pulses to the ramps.

      -- In reality one would expect a time of 5 to 10 seconds.  In

      -- the interests of speeding up the test suite a shorter time

      -- is used

      Pulse_Time_Delta : constant duration := ImpDef.Long_Switch_To_New_Task;

      -- control over stopping tasks

      protected Control is

         procedure Stop_Now;

         function Stop return Boolean;

      private

         Halt : Boolean := False;

      end Control;

      protected body Control is

         procedure Stop_Now is

         begin

            Halt := True;

         end Stop_Now;

         function Stop return Boolean is

         begin

            return Halt;

         end Stop;

      end Control;

      task Pulse_Task;       -- task to generate a pulse for each ramp

      -- Carrier task. One is created for each vehicle arriving at the ramp

      task type Vehicle;

      type acc_Vehicle is access Vehicle;

      --================================================================

      protected Test_Ramp is

         function Next_Ramp_in_Overload return Load_Factor;

         function Local_Overload        return Load_Factor;

         function Freeway_Overload      return Load_Factor;

         function Freeway_Breakdown     return Boolean;

         function Meter_in_use_State    return Boolean;

         procedure Set_Local_Overload;

         procedure Add_Meter_Queue;

         procedure Subtract_Meter_Queue;

         procedure Time_Pulse_Received;

         entry Wait_at_Meter;

         procedure TC_Passage (Pass_Point : Integer);

         function TC_Get_Passage_Total return integer;

         -- ::::::::: many routines are not shown (for example none of the

         --            clears, none of the real-time-sensor handlers)

      private

         Release_One_Vehicle : Boolean := false;

         Meter_in_Use        : Boolean := false;

         Fwy_Break_State     : Boolean := false;

         Ramp_Count : integer range 0..20 := 0;

         Ramp_Count_Threshold : integer := 15;

         -- Current state of the various Sample Points

         Local_State     : Load_Factor := Clear_Level;

         Next_Ramp_State : Load_Factor := Clear_Level;

            -- ::::  other Sample Point states not shown

         TC_Passage_Total : integer := 0;

      end Test_Ramp;

      --================================================================

      protected body Test_Ramp is

            procedure Start_Meter is

            begin

               Meter_in_Use := True;

               null;  -- stub  :::: trigger the metering hardware

            end Start_Meter;

         -- External call for Meter_in_Use

         function Meter_in_Use_State return Boolean is

         begin

            return Meter_in_Use;

         end Meter_in_Use_State;

         -- Trace the paths through the various routines by totaling the

         -- weighted call parameters

         procedure TC_Passage (Pass_Point : Integer) is

         begin

            TC_Passage_Total := TC_Passage_Total+(Pass_Point*TC_Multiplier);

         end TC_Passage;

         -- For the final check of the whole test

         function TC_Get_Passage_Total return integer is

         begin

            return TC_Passage_Total;

         end TC_Get_Passage_Total;

         -- These Set/Clear routines are triggered by real-time sensors that

         -- reflect traffic state

         procedure Set_Local_Overload is

         begin

            Local_State := Local_Overload_wt;

            if not Meter_in_Use then

               Start_Meter;   -- LOCAL INTERNAL PROCEDURE FROM PROCEDURE

            end if;

         end Set_Local_Overload;

         --::::: Set/Clear routines for all the other sensors not shown

         function Local_Overload return Load_Factor is

         begin

            return Local_State;

         end Local_Overload;

         function Next_Ramp_in_Overload return Load_Factor is

         begin

            return Next_Ramp_State;

         end Next_Ramp_in_Overload;

         -- ::::::::  other overload factor states not shown

         -- return the summation of all the load factors

         function Freeway_Overload return Load_Factor is

         begin

            return    Local_Overload                    -- EACH IS A CALL OF A

                      -- + :::: others                  -- FUNCTION FROM WITHIN

                      + Next_Ramp_in_Overload;          -- A FUNCTION

         end Freeway_Overload;

         -- Freeway Breakdown is defined as traffic moving < 5mph

         function Freeway_Breakdown return Boolean is

         begin

            return Fwy_Break_State;

         end Freeway_Breakdown;

         -- Keep count of vehicles currently on meter queue - we can't use

         -- the 'count because we need the outcall trigger

         procedure Add_Meter_Queue is

            TC_Pass_Point : constant integer := 22;

         begin

            Ramp_Count := Ramp_Count + 1;

            TC_Passage ( TC_Pass_Point );  -- note passage through here

            if Ramp_Count > Ramp_Count_Threshold then

               null;  -- :::: stub, trigger surface street notification

            end if;

         end Add_Meter_Queue;

         --

         procedure Subtract_Meter_Queue is

            TC_Pass_Point : constant integer := 24;

         begin

            Ramp_Count := Ramp_Count - 1;

            TC_Passage ( TC_Pass_Point );  -- note passage through here

         end Subtract_Meter_Queue;

         -- Here each Vehicle task queues itself awaiting release

         entry Wait_at_Meter when Release_One_Vehicle is

         -- EXAMPLE OF ENTRY WITH BARRIERS AND PERSISTENT SIGNAL

            TC_Pass_Point : constant integer := 23;

         begin

            TC_Passage ( TC_Pass_Point );   -- note passage through here

            Release_One_Vehicle := false;   -- Consume the signal

            -- Decrement number of vehicles on ramp

            Subtract_Meter_Queue;  -- CALL PROCEDURE FROM WITHIN ENTRY BODY

         end Wait_at_Meter;

         procedure Time_Pulse_Received is

            Load : Load_factor := Freeway_Overload; -- CALL MULTILEVEL

                                                    -- FUNCTION

                                                    -- FROM WITHIN PROCEDURE

         begin

            -- if broken down, no vehicles are released

            if not Freeway_Breakdown then    -- CALL FUNCTION FROM A PROCEDURE

               if Load < Moderate_Level then

                  Release_One_Vehicle := true;

               end if;

               null;    -- stub  ::: If other levels, release every other

                        --           pulse, every third pulse  etc.

            end if;

         end Time_Pulse_Received;

      end Test_Ramp;

      --================================================================

      -- Simulate the arrival of a vehicle at the Ramp_Receiver and the

      -- generation of an accompanying carrier task

      procedure New_Arrival is

         Next_Vehicle_Task: acc_Vehicle := new Vehicle;

         TC_Pass_Point : constant integer := 3;

      begin

         Test_Ramp.TC_Passage ( TC_Pass_Point );  -- Note passage through here

         null;

      end New_arrival;

      -- Carrier task. One is created for each vehicle arriving at the ramp

      task body Vehicle is

         TC_Pass_point   : constant integer :=  1;

         TC_Pass_Point_2 : constant integer := 21;

         TC_Pass_Point_3 : constant integer :=  2;

      begin

         Test_Ramp.TC_Passage ( TC_Pass_Point );  -- note passage through here

         if Test_Ramp.Meter_in_Use_State then

            Test_Ramp.TC_Passage ( TC_Pass_Point_2 );  -- note passage

            -- Increment count of number of vehicles on ramp

            Test_Ramp.Add_Meter_Queue;    -- CALL a protected PROCEDURE

                                          -- which is also called from within

            -- enter the meter queue

            Test_Ramp.Wait_at_Meter;      -- CALL a protected ENTRY

         end if;

         Test_Ramp.TC_Passage ( TC_Pass_Point_3 );  -- note passage thru here

         null;  --:::: call to the first in the series of the Ramp_Sensors

                --     this "passes" the vehicle from one sensor to the next

      exception

         when others =>

               Report.Failed ("Unexpected exception in Vehicle Task");

      end Vehicle;

      -- Task transmits a synchronizing "pulse" to all ramps

      --

      task body Pulse_Task is

         Pulse_Time : Ada.Calendar.Time := Ada.Calendar.Clock;

      begin

         While not Control.Stop loop

            delay until Pulse_Time;

            Test_Ramp.Time_Pulse_Received;  -- causes INTERNAL CALLS

            -- ::::::::::  and to all the others

            Pulse_Time := Pulse_Time + Pulse_Time_Delta; -- calculate next

         end loop;

      exception

         when others =>

               Report.Failed ("Unexpected exception in Pulse_Task");

      end Pulse_Task;

   begin -- declare

      -- Test driver.  This is ALL test control code

      -- First simulate calls to the protected functions and procedures

      -- from without the protected object

      --

      -- CALL FUNCTIONS

      if Test_Ramp.Local_Overload /= Clear_Level then

         Report.Failed ("External Call to Local_Overload incorrect");

      end if;

      if Test_Ramp.Next_Ramp_in_Overload /= Clear_Level then

         Report.Failed ("External Call to Next_Ramp_in_Overload incorrect");

      end if;

      if Test_Ramp.Freeway_Overload /= Clear_Level then

         Report.Failed ("External Call to Freeway_Overload incorrect");

      end if;

      -- Now Simulate the arrival of a vehicle to verify path through test

      New_Arrival;

      delay Pulse_Time_Delta*2;  -- allow it to pass through the complex

      TC_Multiplier := 5;  -- change the weights for the paths for the next

                           -- part of the test

      -- Simulate a real-time sensor reporting overload

      Test_Ramp.Set_Local_Overload;  -- CALL A PROCEDURE  (and change levels)

      -- CALL FUNCTIONS again

      if Test_Ramp.Local_Overload /= Minimum_Level then

         Report.Failed ("External Call to Local_Overload incorrect - 2");

      end if;

      if Test_Ramp.Freeway_Overload /= Minimum_Level then

         Report.Failed ("External Call to Freeway_Overload incorrect -2");

      end if;

      -- Now Simulate the arrival of another vehicle again causing

      -- INTERNAL CALLS but following different paths (queuing on the

      -- meter etc.)

      New_Arrival;

      delay Pulse_Time_Delta*2;  -- allow it to pass through the complex

      Control.Stop_Now;  -- finish test

      if TC_Expected_Passage_Total /= Test_Ramp.TC_Get_Passage_Total then

         Report.Failed ("Unexpected paths taken");

      end if;

   end; -- declare

   Report.Result;

end C940005;